phylib: wait for TN2020 to achieve SERDES lane alignment at startup

Before the Teranetics TN2020 PHY can be used, the SERDES lanes need to be
aligned, so wait for lane alignment before completing the startup sequence.

Note that this process can take up to three seconds.

Signed-off-by: Timur Tabi <timur@freescale.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>

diff --git a/drivers/net/phy/teranetics.c b/drivers/net/phy/teranetics.c
index a13b48cee6eb602643c2d6baa3bae92350237de1..9d9397aadd45b51144422a56f1753986dfdf1e80 100644 (file)
--- a/drivers/net/phy/teranetics.c
+++ b/drivers/net/phy/teranetics.c
@@ -21,6 +21,7 @@
  *
  */
 #include <config.h>
+#include <common.h>
 #include <phy.h>
 
 #ifndef CONFIG_PHYLIB_10G
@@ -43,6 +44,38 @@ int tn2020_config(struct phy_device *phydev)
 
 int tn2020_startup(struct phy_device *phydev)
 {
+       unsigned int timeout = 5 * 1000; /* 5 second timeout */
+
+#define MDIO_PHYXS_LANE_READY (MDIO_PHYXS_LNSTAT_SYNC0 | \
+                              MDIO_PHYXS_LNSTAT_SYNC1 | \
+                              MDIO_PHYXS_LNSTAT_SYNC2 | \
+                              MDIO_PHYXS_LNSTAT_SYNC3 | \
+                              MDIO_PHYXS_LNSTAT_ALIGN)
+
+       /*
+        * Wait for the XAUI-SERDES lanes to align first.  Under normal
+        * circumstances, this can take up to three seconds.
+        */
+       while (--timeout) {
+               int reg = phy_read(phydev, MDIO_MMD_PHYXS, MDIO_PHYXS_LNSTAT);
+               if (reg < 0) {
+                       printf("TN2020: Error reading from PHY at "
+                              "address %u\n", phydev->addr);
+                       break;
+               }
+               if ((reg & MDIO_PHYXS_LANE_READY) == MDIO_PHYXS_LANE_READY)
+                       break;
+               udelay(1000);
+       }
+       if (!timeout) {
+               /*
+                * A timeout is bad, but it may not be fatal, so don't
+                * return an error.  Display a warning instead.
+                */
+               printf("TN2020: Timeout waiting for PHY at address %u to "
+                      "align.\n", phydev->addr);
+       }
+
        if (phydev->port != PORT_FIBRE)
                return gen10g_startup(phydev);